Semiconductor device and semiconductor system

ABSTRACT

A semiconductor system includes a first semiconductor device suitable for outputting an external command and a termination control signal and being inputted with a data signal; and a second semiconductor device suitable for generating a termination enable signal in response to the external command and the termination control signal, generating a pull-up signal in response to the termination enable signal, and generating a pull-down signal in response to the termination enable signal and a test mode signal.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority under 35 U.S.C. § 119(a) toKorean application number 10-2015-0125805 filed on Sep. 4, 2015, in theKorean Intellectual Property Office, which is incorporated herein byreference in its entirety.

BACKGROUND

1. Technical Field

Embodiments of the present disclosure generally relate to an integratedcircuit and an electronic device, and more particularly to asemiconductor device and a semiconductor system capable of testing atermination operation.

2. Related Art

As an operation speed of a semiconductor device increases, a signalswing gradually decreases to minimize a propagation delay that may occurduring the signal transmission. Such small-amplitude signals are highlysusceptible to interference and noise. In addition, an impedancemismatch condition may reduce the power transfer of the signal and alsocause signal reflection at interfaces between different transmissionlines. As a result, it is difficult for semiconductor device usingsmall-amplitude signals to carry out high-speed data transmissionwithout any distortion to the signals. Also, the impedance mismatchcondition causes a signal transmission error.

In order for the transmission lines to minimize distortion of the signaland the signal transmission error, the impedance of the differenttransmission lines must be uniform. When the transmission lines are inthe impedance mismatch condition, a termination impedance may be placedat interfaces between different transmission lines to achieve impedancematching. For instance, the semiconductor device performs a terminationoperation by coupling a termination resistor having the same impedanceas a characteristic impedance of a transmission line to a receptionterminal or a transmission terminal of a signal. Here, the impedance ofthe termination resistor matches the impedance of the reception terminalor the transmission terminal and the characteristic impedance of thetransmission line. Instead of having termination resistor locatedoutside a semiconductor chip, On-Die Termination (ODT) allows thetermination resistor to be located inside the semiconductor chips.

SUMMARY

Various embodiments are directed to a semiconductor device and asemiconductor system, capable of testing whether a termination operationis normally performed.

In an embodiment, a semiconductor system may include: a firstsemiconductor device suitable for outputting an external command and atermination control signal, and being inputted with a data signal; and asecond semiconductor device suitable for generating a termination enablesignal in response to the external command the termination controlsignal, generating a pull-up signal in response to the terminationenable signal, and generating a pull-down signal in response to thetermination enable signal and a test mode signal.

In an embodiment, a semiconductor device may include: a pull-up signalgeneration unit suitable for generating a pull-up signal in response toa termination enable signal and a pre-pull-up signal; and a pull-downsignal generation unit suitable for generating a pull-down signal inresponse to a test mode signal, the termination enable signal and apre-pull-down signal.

According to the embodiments, through controlling a voltage level of adata pad according to whether a termination operation is performed in atest mode, it is possible to determine whether the termination operationis normally performed, by sensing the voltage level of the data pad.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating a semiconductor system inaccordance with an embodiment.

FIG. 2 is a diagram illustrating an output driver included in thesemiconductor system shown in FIG. 1.

FIG. 3 is a circuit diagram illustrating a pull-up signal generationunit included in the output driver shown in FIG. 2.

FIG. 4 is a circuit diagram illustrating a pull-down signal generationunit included in the output driver shown in FIG. 2.

FIG. 5 is a circuit diagram illustrating a pull-down signal generationunit included in the output driver shown in FIG. 2.

FIG. 6 is a timing diagram provided to assist in explaining an operationof the semiconductor system shown in FIGS. 1 to 5.

FIG. 7 is a diagram illustrating an electronic system to which thesemiconductor devices and the semiconductor system shown in FIGS. 1 to 6are applied.

DETAILED DESCRIPTION

Hereinafter, a semiconductor device and a semiconductor system will bedescribed below with reference to the accompanying drawings throughvarious examples of embodiments.

As shown in FIG. 1, a semiconductor system in accordance with anembodiment may include a first semiconductor device 11 and a secondsemiconductor device 12.

The first semiconductor device 11 may output an external command CMD anda termination control signal ODT_CNT. The first semiconductor device 11may be inputted with a data signal DQ. The external command CMD mayinclude a plurality of bits, and be set to various combinations of logiclevels. The external command CMD may be transmitted through lines thatis used for transmitting only a command or lines that is used fortransmitting both the command and an address. The termination controlsignal ODT_CNT may be inputted to control a termination operation of thesecond semiconductor device 12. During the termination operation of thesecond semiconductor device 12, a termination resistor is coupled to apad through which signals are inputted and outputted.

The second semiconductor device 12 may include a pad block 13, a commanddecoder 14, a termination control signal buffer 15, a termination enablesignal generation block 16, and an output driver 17. The pad block 13may include a first pad 131, a second pad 132, and a third pad 133. Thefirst pad 131 may be inputted with the external command CMD from thefirst semiconductor device 11. The second pad 132 may be inputted withthe termination control signal ODT_CNT from the first semiconductordevice 11. The third pad 133 may output the data signal DQ to the firstsemiconductor device 11.

The command decoder 14 may be inputted with the external command CMD,and generate a write command WT. The command decoder 14 may be inputtedwith the external command CMD through the first pad 131. The writecommand WT may be enabled in the case where the external command CMD hasa preset logic level combination. A logic level at which the writecommand WT is enabled may be set in a variety of ways according toembodiments. The second semiconductor device 12 may perform a writeoperation in response to an enabled write command WT. During the writeoperation, the second semiconductor device 12 may be inputted with adata signal DQ through the third pad 133. In the case where the writecommand WT is enabled and the write operation is performed, the secondsemiconductor device 12 may perform the termination operation for thethird pad 133.

The termination control signal buffer 15 may generate an internaltermination control signal IODT_CNT in response to the terminationcontrol signal ODT_CNT. The termination control signal buffer 15 may beinputted with the termination control signal ODT_CNT through the secondpad 132. The termination control signal buffer 15 may generate anenabled internal termination control signal IODT_CNT in response to anenabled termination control signal ODT_CNT. The termination controlsignal ODT_CNT may be a control signal that carries out the terminationoperation of the second semiconductor device 12. A logic level at whichthe internal termination control signal IODT_CNT is enabled may be setin a variety of ways according to embodiments.

The termination enable signal generation unit 16 may generate atermination enable signal ODT_EN in response to the write command WT andthe internal termination control signal IODT_CNT. The termination enablesignal generation unit 16 may generate an enabled termination enablesignal ODT_EN in response to the write command WT and the enabledinternal termination control signal IODT_CNT is enabled. The terminationenable signal ODT_EN may be enabled to perform the termination operationof the second semiconductor device 12. A logic level at which thetermination enable signal ODT_EN is enabled may be set in a variety ofways according to embodiments. When the termination operation isperformed in response to the enabled termination enable signal ODT_EN, atermination resistor is coupled to the third pad 133.

The output driver 17 may drive the data signal DQ in response to thetermination enable signal ODT_EN and a test mode signal TM. The outputdriver 17 may output the data signal DQ to the first semiconductordevice 11 through the third pad 133. The test mode signal TM may beenabled in a test mode for testing the termination operation. The testmode signal TM may be inputted from the first semiconductor device 11 ora separate test equipment (not shown). The test mode signal TM may begenerated inside the second semiconductor device 12 according to anembodiment. The output driver 17 may drive the third pad 133 with apower supply voltage VDD in response to the enabled termination enablesignal ODT_EN is enabled when it is not in the test mode, and may allowthe third pad 133 to float in response to the disabled terminationenable signal ODT_EN when it is not in the test mode. The output driver17 may drive the data signal DQ with the power supply voltage VDD, inthe case where the termination enable signal ODT_EN is enabled in astate in which the test mode is entered, and may pull the data signal DQto a ground voltage VSS, in the case where the termination enable signalODT_EN is disabled in a state in which the test mode is entered. Theoutput driver 17 may output internal data, which has been outputted froma memory cell array (not shown) in a read operation, as a data signal DQthrough the third pad 133.

Referring to FIG. 2, the output driver 17 may include a pull-up signalgeneration unit 21, a pull-up driver 22, a pull-down signal generationunit 23, and a pull-down driver 24.

The pull-up signal generation unit 21 may generate a pull-up signal PUin response to the termination enable signal ODT_EN and a pre-pull-upsignal PRE_PU. The pull-up signal generation unit 21 may generate anenabled pull-up signal PU, which is at a logic low level, in response tothe enabled termination enable signal ODT_EN, which is at a logic highlevel. The pull-up signal generation unit 21 may generate a disabledpull-up signal PU, which is at a logic high level, in response to thedisabled termination enable signal ODT_EN, which is at a logic lowlevel. In other words, in the case where the termination operation isperformed, the pull-up signal generation unit 21 may generate theenabled pull-up signal PU, which is at the logic low level. In the readoperation, the pull-up signal generation unit 21 may generate thepull-up signal PU according to a level of the pre-pull-up signal PRE_PU.The read operation may be performed in a state in which the terminationenable signal ODT_EN is disabled. The pre-pull-up signal PRE_PU may beset in its level according to internal data outputted from the memorycell array in the read operation. For example, in the case where theinternal data is at a logic high level, the pull-up signal generationunit 21 may be inputted with the pre-pull-up signal PRE_PU that is at alogic high level, and generate the enabled pull-up signal PU, which isat the logic low level. In the case where the internal data is at alogic low level, the pull-up signal generation unit 21 may be inputtedwith the pre-pull-up signal PRE_PU that is at a logic low level, andgenerate the disabled pull-up signal PU, which is at the logic highlevel.

The pull-up driver 22 may include a PMOS transistor P21 and a resistorelement R21. The PMOS transistor P21 coupled between the power supplyvoltage VDD and a node nd21 may be turned on in response to the pull-upsignal PU. The resistor element R21 may be coupled between the node nd21and a node nd22. The node nd22 may be coupled to the third pad 133through which the data signal DQ is outputted. In the case where thepull-up driver 22 is inputted with the enabled pull-up signal PU, whichis at the logic low level, the pull-up driver 22 may drive the node nd22with the power supply voltage VDD as the PMOS transistor P21 is turnedon. In the case where the pull-up driver 22 is inputted with the pull-upsignal PU, which is enabled as the termination operation is performed,the resistor element R21 may be used as a termination resistor.

The pull-down signal generation unit 23 may generate a pull-down signalPD in response to the termination enable signal ODT_EN, the test modesignal TM and a pre-pull-down signal PRE_PD. In the case where the testmode is not entered and thus the test mode signal TM is disabled to alogic low level, the pull-down signal generation unit 23 may generatethe disabled pull-down signal PD, which is at a logic low level,regardless of the termination enable signal ODT_EN. In the case wherethe termination enable signal ODT_EN is enabled in a state in which thetest mode is entered and thus the test mode signal TM is enabled, thepull-down signal generation unit 23 may generate the enabled pull-downsignal PD, which is at the logic low level. In the case where thetermination enable signal ODT_EN is disabled in a state in which thetest mode is entered and thus the test mode signal TM is enabled, thepull-down signal generation unit 23 may generate the enabled pull-downsignal PD, which is at a logic high level. In the case where thetermination operation is not performed in the test mode, the pull-downsignal generation unit 23 may generate the enabled pull-down signal PD,which is at the logic high level. In the read operation, the pull-downsignal generation unit 23 may generate the pull-down signal PD accordingto a level of the pre-pull-down signal PRE_PD. The read operation may beperformed in a state in which the termination enable signal ODT_EN isdisabled. The pre-pull-down signal PRE_PD may be set in its levelaccording to internal data outputted from the memory cell array in theread operation. For example, in the case where the internal data is atthe logic high level, the pull-down signal generation unit 23 may beinputted with the pre-pull-down signal PRE_PD that is at a logic highlevel, and generate the disabled pull-down signal PD, which is at thelogic low level. In the case where the internal data is at the logic lowlevel, the pull-down signal generation unit 23 may be inputted with thepre-pull-down signal PRE_PD that is at low level, and generate theenabled pull-down signal PD, which is at the logic high level.

The pull-down driver 24 may include an NMOS transistor N21 and aresistor element R22. The NMOS transistor N21 may be coupled between theground voltage VSS and a node nd23, and be turned on in response to thepull-down signal PD. The resistor element R22 may be coupled between thenode nd22 and the node nd23. The node nd22 may be coupled to the thirdpad 133 through which the data signal DQ is outputted. In the case wherethe pull-down driver 24 is inputted with the enabled pull-down signalPD, which is at the logic high level, the pull-down driver 24 may drivethe node nd22 with the ground voltage VSS as the NMOS transistor N21 isturned on.

Referring to FIG. 3, the pull-up signal generation unit 21 may include apull-up pre-driver 31 and a pull-up control section 32. The pull-uppre-driver 31 may include PMOS transistors P31 and P32 and NMOStransistors N31 and N32. The PMOS transistor P31 coupled between thepower supply voltage VDD and a node nd31 may be turned on in response tothe termination enable signal ODT_EN. The PMOS transistor P32 coupledbetween the node nd31 and a node nd32 may be turned on in response tothe pre-pull-up signal PRE_PU. The NMOS transistor N31 coupled betweenthe node nd32 and a node nd33 may be turned on in response to thepre-pull-up signal PRE_PU. The NMOS transistor N32 coupled between thenode nd33 and the ground voltage VSS may be turned on in response to thepower supply voltage VDD. In the case where the PMOS transistor P31 isturned on in response to the disabled termination enable signal ODT_EN,which is at the logic low level, the pull-up pre-driver 31 may drive thenode nd32 according to a logic level of the pre-pull-up signal PRE_PUwhich is inputted in the read operation. In the case where thepre-pull-up signal PRE_PU of the logic high level is inputted in theread operation, the pull-up pre-driver 31 may drive the node nd32 withthe ground voltage VSS, and generate the enabled pull-up signal PU,which is at the logic low level. In the case where the pre-pull-upsignal PRE_PU of the logic low level is inputted in the read operation,the pull-up pre-driver 31 may drive the node nd32 with the power supplyvoltage VDD, and generate the disabled pull-up signal PU, which is atthe logic high level.

The pull-up control section 32 may include an NMOS transistor N33. TheNMOS transistor N33 coupled between the node nd32 and the ground voltageVSS may be turned on in response to the termination enable signalODT_EN. In the case where the NMOS transistor N33 is turned on inresponse to the enabled termination enable signal ODT_EN, which is atthe logic high level, the pull-up control section 32 may drive the nodend32 with the ground voltage VSS, and generate the enabled pull-upsignal PU, which is at the logic low level.

Referring to FIG. 4, the pull-down signal generation unit 23 may includea pull-down control signal generation section 41, a pull-down pre-driver42, and a pull-down control section 43. The pull-down control signalgeneration section 41 may include inverters IV41 and IV42 and a NANDgate NAND41. The inverter IV41 may invert the termination enable signalODT_EN, and output a resultant signal. The NAND gate NAND41 may performa NAND operation on the output of the inverter IV41 and the test modesignal TM, and output a resultant signal. The inverter IV42 may invertthe output of the NAND gate NAND41, and generate a pull-down controlsignal PD_CNT. The pull-down control signal generation section 41 maygenerate an enabled pull-down control signal PD_CNT, which is at a logichigh level, in response to the enabled test mode signal TM, which is atthe logic high level, and the disabled termination enable signal ODT_EN,which is at the logic low level.

The pull-down pre-driver 42 may include PMOS transistors P41 and P42 andNMOS transistors N41 and N42. The PMOS transistor P41 coupled betweenthe power supply voltage VDD and a node nd41 may be turned on inresponse to the pull-down control signal PD_CNT. The PMOS transistor P42coupled between the node nd41 and a node nd42 may be turned on inresponse to the pre-pull-down signal PRE_PD. The NMOS transistor N41coupled between the node nd42 and a node nd43 may be turned on inresponse to the pre-pull-down signal PRE_PD. The NMOS transistor N42coupled between the node nd43 and the ground voltage VSS may be turnedon in response to the power supply voltage VDD. In the case where thePMOS transistor P41 is turned on in response to the disabled pull-downcontrol signal PD_CNT, which is at a logic low level, the pull-downpre-driver 42 may drive the node nd42 according to a logic level of thepre-pull-down signal PRE_PD, which is inputted in the read operation. Inthe case where the pre-pull-down signal PRE_PD of the logic high levelis inputted in the read operation, the pull-down pre-driver 42 may drivethe node nd42 with the ground voltage VSS, and generate the disabledpull-down signal PD, which is at the logic low level. In the case wherethe pre-pull-down signal PRE_PD that is at the logic low level isinputted in the read operation, the pull-down pre-driver 42 may drivethe node nd42 with the power supply voltage VDD, and generate theenabled pull-down signal PD, which is at the logic high level.

The pull-down control section 43 may include an inverter IV43 and a PMOStransistor P43. The inverter IV43 may invert the pull-down controlsignal PD_CNT, and output a resultant signal. The PMOS transistor P43may be coupled between the power supply voltage VDD and the node nd42,and be turned on by being inputted with the output of the inverter IV43.In the case where the PMOS transistor P43 is turned on in response tothe enabled pull-down control signal PD_CNT, which is at the logic highlevel, the pull-down control section 43 may drive the node nd42 with thepower supply voltage VDD, and generate the enabled pull-down signal PD,which is at the logic high level.

FIG. 5 is a diagram illustrating the pull-down signal generation unit 23in accordance with an embodiment. Referring to FIG. 5, the pull-downsignal generation unit 23 may include a pull-down control signalgeneration section 51, a pull-down pre-driver 52, a pull-down controlsection 53, and a buffer 54. The pull-down control signal generationsection 51 may include inverters IV51 and IV52 and a NAND gate NAND51.The inverter IV51 may invert the termination enable signal ODT_EN, andoutput a resultant signal. The NAND gate NAND51 may perform a NANDoperation on the output of the inverter IV51 and the test mode signalTM, and output a resultant signal. The inverter IV52 may invert theoutput of the NAND gate NAND51, and generate the pull-down controlsignal PD_CNT. The pull-down control signal generation section 51 maygenerate the pull-down control signal PD_CNT, which is at a logic highlevel, in response to the enabled test mode signal TM, which is at thelogic high level, and the disabled termination enable signal ODT_EN,which is at the logic low level.

The pull-down pre-driver 52 may include PMOS transistors P51 and P52 andNMOS transistors N51 and N52. The PMOS transistor P51 coupled betweenthe power supply voltage VDD and a node nd51 may be turned on inresponse to the pull-down control signal PD_CNT. The PMOS transistor P52coupled between the node nd51 and a node nd52 may be turned on inresponse to the pre-pull-down signal PRE_PD. The NMOS transistor N51coupled between the node nd52 and a node nd53 may be turned on inresponse to the pre-pull-down signal PRE_PD. The NMOS transistor N52coupled between the node nd53 and the ground voltage VSS may be turnedon in response to the power supply voltage VDD. In the case where thePMOS transistor P51 is turned on in response to the disabled pull-downcontrol signal PD_CNT, which is at a logic low level, the pull-downpre-driver 52 may drive the node nd52 according to a logic level of thepre-pull-down signal PRE_PD, which is inputted in the read operation. Inthe case where the pre-pull-down signal PRE_PD of the logic high levelis inputted in the read operation, the pull-down pre-driver 52 may drivethe node nd52 with the ground voltage VSS. In the case where thepre-pull-down signal PRE_PD of the logic low level is inputted in theread operation, the pull-down pre-driver 52 may drive the node nd52 withthe power supply voltage VDD.

The pull-down control section 53 may include an NMOS transistor N53. TheNMOS transistor N53 coupled between the ground voltage VSS and the nodend52 may be turned on in response to the pull-down control signalPD_CNT. In the case where the NMOS transistor N53 is turned on inresponse to the enabled pull-down control signal PD_CNT, which is at thelogic high level, the pull-down control section 53 may drive the nodend52 with the ground voltage VSS. The buffer 54 may include an inverterIV53. The buffer 54 may invert the signal of the node nd52, and generatethe pull-down signal PD. The buffer 54 may generate the disabledpull-down signal PD, which is at the logic low level, in the case wherethe node nd52 is driven with the power supply voltage VDD, and generatethe enabled pull-down signal PD, which is at the logic high level, inthe case where the node nd52 is driven with the ground voltage VSS.

Operations according to an embodiment will be described below withreference to FIG. 6, based on the level of the data signal DQ accordingto the termination enable signal ODT_EN in the case where thesemiconductor system or the semiconductor device is not in the test modeand in the case where the semiconductor system or the semiconductordevice is in the test mode.

In a period T11 to T12, when the semiconductor system or thesemiconductor device is not in the test mode, and the test mode signalTM is disabled, the termination enable signal ODT_EN is enabled toperform the termination operation. In the case where the terminationoperation is performed during a period that is not the test mode, thethird pad 133 through which the data signal DQ is outputted may bedriven with the power supply voltage VDD. Accordingly, the data signalDQ may have a logic high level.

In a period T12 to T13, when the semiconductor system or thesemiconductor device is not in the test mode, and the test mode signalTM is still disabled, the termination operation is not performed andthus the termination enable signal ODT_EN is disabled. In the case wherethe termination operation is not performed during a period that is notthe test mode, the third pad 133 through which the data signal DQ isoutputted may float. Accordingly, the data signal DQ may not have anylogic level.

In a period T13 to T14, the termination operation is not performed andthus the termination enable signal ODT_EN is disabled in the state wherethe test mode is entered and thus the test mode signal TM is enabled. Inthe case where the termination operation is not performed during aperiod that is the test mode, the third pad 133 through which the datasignal DQ is outputted may be driven with the ground voltage VSS.Accordingly, the data signal DQ may have a logic low level.

In a period T14 to T15, the termination operation is performed and thusthe termination enable signal ODT_EN is enabled in the state where thetest mode is entered and thus the test mode signal TM is enabled. In thecase where the termination operation is performed during a period whichis the test mode, the third pad 133 through which the data signal DQ isoutputted may be driven with the power supply voltage VDD. Accordingly,the data signal DQ may have the logic high level.

As described above, the third pad 133 is driven to a logic high level inthe case where the termination enable signal ODT_EN is enabled and thusthe termination operation is performed during a period that is not thetest mode, and the third pad 133 floats in the case where thetermination enable signal ODT_EN is disabled, and thus the terminationoperation is not performed during a period that is not the test mode. Bycontrast, in the test mode, when the termination enable signal ODT_EN isenabled and thus the termination operation is performed, the third pad133 is driven to the logic high level, and when the termination enablesignal ODT_EN is disabled and thus the termination operation is notperformed, the third pad 133 is driven to a logic low level. Therefore,by sensing the voltage level of the third pad 133, it is possible todetermine whether the termination operation is performed or not.

The semiconductor devices and the semiconductor system described abovewith reference to FIGS. 1 to 6 may be applied to an electronic systemthat includes a memory system, a graphic system, a computing system or amobile system. For example, referring to FIG. 7, an electronic system1000 in accordance with an embodiment may include a data storage 1001, amemory controller 1002, a buffer memory 1003, and an input/outputinterface 1004.

In response to control signals from the memory controller 1002, the datastorage 1001 stores data applied from the memory controller 1002, andreads out stored data, and outputs the read-out data to the memorycontroller 1002. The data storage 1001 may include the secondsemiconductor device 12 shown in FIG. 1. The data storage 1001 mayinclude a nonvolatile memory that can retain data even in the absence ofpower supplies. A nonvolatile memory may be realized as a flash memorysuch as a NOR flash memory and a NAND flash memory, a phase changerandom access memory (PRAM), a resistive random access memory (RRAM), aspin torque transfer random access memory (STTRAM) or a magnetic randomaccess memory (MRAM).

The memory controller 1002 decodes commands applied through theinput/output interface 1004 from an external device Host, and controlsinput/output of data with respect to the data storage 1001 and thebuffer memory 1003 according to decoding results. The memory controller1002 may include the first semiconductor device 11 shown in FIG. 1.While the memory controller 1002 is illustrated as having only one blockin FIG. 7, the memory controller 1002 may include a controller forcontrolling the data storage 1001 such as a nonvolatile memory and acontroller for controlling the buffer memory 1003 such as a volatilememory.

The buffer memory 1003 may temporarily store data to be processed in thememory controller 1002, that is, data to be inputted/outputted to/fromthe data storage 1001. The buffer memory 1003 may store data appliedfrom the memory controller 1002 according to a control signal. Thebuffer memory 1003 reads out stored data and outputs the read-out datato the memory controller 1002. The buffer memory 1003 may include avolatile memory such as a dynamic random access memory (DRAM), a mobileDRAM, and a static random access memory (SRAM).

The input/output interface 1004 provides a communication between thememory controller 1002 and the external device Host such that the memorycontroller 1002 may receive control signals for input/output of datafrom the external device and exchange data with the external device. Theinput/output interface 1004 may include one or more of interfaceprotocols such as USB, MMC, PCI-E, SAS, SATA, PATA, SCSI, ESDI and IDE.

The electronic system 1000 may be used as an auxiliary memory device oran external storage device of the host. The electronic system 1000 mayinclude a solid state disk (SSD), a USB memory (universal serial busmemory), a secure digital (SD) card, a mini-secure digital (mSD) card, amicro SD card, a secure digital high capacity (SDHC) card, a memorystick card, a smart media (SM) card, a multimedia card (MMC), anembedded MMC (eMMC), or a compact flash (CF) card.

While various embodiments have been described above, it will beunderstood to those skilled in the art that the embodiments describedare by way of example only. Accordingly, the semiconductor device andthe semiconductor system described herein should not be limited based onthe described embodiments.

What is claimed is:
 1. A semiconductor system comprising: a firstsemiconductor device suitable for outputting an external command and atermination control signal and being inputted with a data signal; and asecond semiconductor device suitable for generating a termination enablesignal in response to the external command and the termination controlsignal, generating a pull-up signal in response to the terminationenable signal, and generating a pull-down signal in response to thetermination enable signal and a test mode signal, wherein the pull-upsignal controls a termination operation that coupled a first resistorelement between a first power supply voltage and a first node.
 2. Thesemiconductor system according to claim 1, wherein the terminationenable signal is enabled if a write command is generated in response tothe external command.
 3. The semiconductor system according to claim 1,wherein the termination enable signal is enabled if the terminationcontrol signal is enabled.
 4. The semiconductor system according toclaim 1, wherein the pull-up signal is enabled if the termination enablesignal is enabled.
 5. The semiconductor system according to claim 1,wherein the pull-down signal is enabled if the termination enable signalis disabled when the semiconductor system is in a test mode according tothe test mode signal.
 6. The semiconductor system according to claim 1,wherein the second semiconductor device pulls up the data signal inresponse to the pull-up signal, and pulls down the data signal inresponse to the pull-down signal.
 7. The semiconductor system accordingto claim 1, wherein the second semiconductor device comprises: atermination enable signal generation unit suitable for generating thetermination enable signal in response to a write command generated fromthe external command and an internal termination control signalgenerated from the termination control signal; and an output driversuitable for driving the data signal in response to the test mode signaland the termination enable signal.
 8. The semiconductor system accordingto claim 7, wherein the output driver comprises: a pull-up signalgeneration unit suitable for generating the pull-up signal in responseto the termination enable signal and a pre-pull-up signal; and apull-down signal generation unit suitable for generating the pull-downsignal in response to the termination enable signal, the test modesignal, and a pre-pull-down signal.
 9. The semiconductor systemaccording to claim 8, wherein the signal levels of the pre-pull-upsignal and the pre-pull-down signal are determined according to internaldata outputted from a memory cell array in a read operation.
 10. Thesemiconductor system according to claim 8, wherein the pull-up signalgeneration unit comprises: a pull-up pre-driver suitable for generatingthe pull-up signal in response to the termination enable signal and thepre-pull-up signal; and a pull-up control section suitable forgenerating an enabled pull-up signal if the termination enable signal isenabled.
 11. The semiconductor system according to claim 8, wherein thepull-down signal generation unit comprises: a pull-down control signalgeneration section suitable for generating a pull-down control signal inresponse to the termination enable signal and the test mode signal; apull-down pre-driver suitable for generating the pull-down signal inresponse to the pull-down control signal and the pre-pull-down signal;and a pull-down control section suitable for generating an enabledpull-down signal if the pull-down control signal is enabled.
 12. Thesemiconductor system according to claim 8, wherein the output driverfurther comprises: a pull-up driver suitable for driving the data signalwith the first power supply voltage in response to the pull-up signal;and a pull-down driver suitable for driving the data signal with asecond power supply voltage in response to the pull-down signal.
 13. Thesemiconductor system according to claim 12, wherein the pull-up drivercomprises: a first MOS transistor coupled between the first power supplyvoltage and the first node, the first MOS transistor being suitable forbeing turned on in response to the pull-up signal; and the firstresistor element coupled between the first node and a second nodethrough which the data signal is outputted.
 14. The semiconductor systemaccording to claim 13, wherein the pull-down driver comprises: a secondMOS transistor coupled between the second power supply voltage and athird node, the second MOS transistor being suitable for being turned onin response to the pull-down signal; and a second resistor elementcoupled between the second node and the third node.